メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.375309025364 43.8274155360888, 142.372868914015 43.8291826349464, 142.370374986854 43.8273683033086, 142.372429387223 43.8259013364, 142.374024081552 43.8267957758502, 142.375588646334 43.8272148701575, 142.375309025364 43.8274155360888)) ^^http://www.opengis.net/ont/geosparql#wktLiteral